[Sound Clip] MTA Regional Bus 2002 Daimler Orion 07.501 CNG 7610

Here is a soundclip of NYMTA's 2002 Daimler Orion 07.501 #7610. The sound clip is split into two parts, so that'll explain the gap you hear.
Engine: Detroit Diesel Series 50G
Transmission: Allison World B400R WTEC III